Skeleton for an Odd-Eyes deck focused on the rituals, without Impcantations. The deck has enough plays without being limited to the ritual summoning, and can make full use of its links, xyz, and synchros (with the fusion being summoned off of Absolute Dragon).
The alternatives were too many to just fit in the side deck, so I'll list them here. Note that most of them probably replace the rituals:
• Destrudo and maybe Gate Infinity
Quick access to a lvl 7 synchro or a link, without taking up your normal or pendulum summon. Can be taken a step further by adding the second Gate and giving the ability to search fusion spells.
• Odd-Eyes Fusion + fusion monsters
Metal Claw, Rune-Eyes, Starving Venom, Venemy, Venemy Lethal Dose, Odd-Eyes Venom & Supreme King Z-ARC are all monsters you could run, though other than Z-ARC I don't think the others make for a particularly interesting variant. And as far as Z-ARC is concerned, one would have a hard time not building into the new insane support, focusing entirely on the big guy, throwing the power level all out of whack.
• Curtain Raiser
Free starter body instead of Supreme King Dragon Darkwurm.
• Coin Dragon
Hilarious buff.
• Phantasma Dragon
Free body in exchange for the ability to pend summon.
• Electrumite
If it ever gets unbanned.
• GranSolfachord Coolia, I:P Masquerena, Knightmare Unicorn
Link options.
(Onto the ones mentioned in the side deck)
• Odd-Eyes Advance Dragon
Both rituals make the opponent pay LP, this can expedite the burn.
• Dissolver, Chronograph Sorcerer
Spellcasters that contribute to swarming, with lesser additional effects. Dissolver can expand the extra deck options with its fusion effect.
• Oafdragon, Celestial Magician
Neat if wonky effects.
• PSY-Framelord Zeta, Ancient Fairy Dragon
Additional synchro 7 options.
• Anthelion
Buff slap.
• Odd-Eyes Rebellion Dragon Overlord, Odd-Eyes Rebellion Dragon
Difficult to use but potentially entertaining options for slapping.
• Pendulum Paradox, Pendulum Treasure
No idea if these are good cards, probably not in this build but I thought they were neat.
• Wavering Eyes
Yes.
Haven't tested it enough.